public void ComparableWeakReference_GetHashCode_ValidTarget_HashCodeShouldBeTargetHashCode()
{
var target = new object();
var reference = new ComparableWeakReference <object>(target);
Assert.AreEqual(target.GetHashCode(), reference.GetHashCode());
}
public void ComparableWeakReference_Equal_ShouldNotBeConsideredEqualToTarget()
{
var target = new object();
var reference = new ComparableWeakReference <object>(target);
Assert.AreNotEqual(target, reference);
Assert.AreNotEqual(reference, target);
}
public void ComparableWeakReference_UseInHashSet_ContainsUsingDifferentReferenceToSameTarget_ShouldReturnTrue()
{
var target = new object();
var reference1 = new ComparableWeakReference <object>(target);
var reference2 = new ComparableWeakReference <object>(target);
var set = new HashSet <ComparableWeakReference <object> > {
reference1
};
Assert.IsTrue(set.Contains(reference2));
}
public void ComparableWeakReference_UseAsDictionaryKey_GetEntryUsingDifferentReferenceToSameTarget_ShouldReturnEntry()
{
var target = new object();
var reference1 = new ComparableWeakReference <object>(target);
var reference2 = new ComparableWeakReference <object>(target);
var dict = new Dictionary <ComparableWeakReference <object>, string>
{
[reference1] = "Ref 1"
};
Assert.AreEqual("Ref 1", dict[reference2]);
}
public void ComparableWeakReference_UseAsDictionaryKey_ContainsKeyUsingDifferentReferenceToSameTarget_ShouldReturnTrue()
{
var target = new object();
var reference1 = new ComparableWeakReference <object>(target);
var reference2 = new ComparableWeakReference <object>(target);
var dict = new Dictionary <ComparableWeakReference <object>, string>
{
[reference1] = "Ref 1"
};
Assert.IsTrue(dict.ContainsKey(reference2));
}
public void ComparableWeakReference_UseInHashSet_RemoveUsingDifferentReferenceToSameTarget_ShouldRemoveEntry()
{
var target = new object();
var reference1 = new ComparableWeakReference <object>(target);
var reference2 = new ComparableWeakReference <object>(target);
var set = new HashSet <ComparableWeakReference <object> > {
reference1
};
set.Remove(reference2);
Assert.AreEqual(0, set.Count);
}
public void ComparableWeakReference_UseInHashSet_MultipleReferencesSameTarget_ShouldBeConsideredDuplicates()
{
var target = new object();
var reference1 = new ComparableWeakReference <object>(target);
var reference2 = new ComparableWeakReference <object>(target);
var reference3 = new ComparableWeakReference <object>(target);
var set = new HashSet <ComparableWeakReference <object> > {
reference1,
reference2,
reference3
};
Assert.AreEqual(1, set.Count);
}
public void ComparableWeakReference_UseAsDictionaryKey_RemoveUsingDifferentReferenceToSameTarget_ShouldRemoveEntry()
{
var target = new object();
var reference1 = new ComparableWeakReference <object>(target);
var reference2 = new ComparableWeakReference <object>(target);
var dict = new Dictionary <ComparableWeakReference <object>, string>
{
[reference1] = "Ref 1"
};
dict.Remove(reference2);
Assert.AreEqual(0, dict.Count);
}
public void ComparableWeakReference_UseInHashSet_MultipleReferencesDifferentTargets_ShouldBeConsideredDifferent()
{
var target1 = new object();
var target2 = new object();
var target3 = new object();
var reference1 = new ComparableWeakReference <object>(target1);
var reference2 = new ComparableWeakReference <object>(target2);
var reference3 = new ComparableWeakReference <object>(target3);
var set = new HashSet <ComparableWeakReference <object> > {
reference1,
reference2,
reference3
};
Assert.AreEqual(3, set.Count);
}
public void ComparableWeakReference_UseAsDictionaryKey_MultipleReferencesSameTarget_ShouldBeConsideredDuplicates()
{
var target = new object();
var reference1 = new ComparableWeakReference <object>(target);
var reference2 = new ComparableWeakReference <object>(target);
var reference3 = new ComparableWeakReference <object>(target);
var dict = new Dictionary <ComparableWeakReference <object>, string>
{
[reference1] = "Ref 1",
[reference2] = "Ref 2",
[reference3] = "Ref 3"
};
Assert.AreEqual(1, dict.Count);
Assert.AreEqual("Ref 3", dict.First().Value);
}
public void ComparableWeakReference_UseAsDictionaryKey_MultipleReferencesDifferentTargets_ShouldBeConsideredDifferent()
{
var target1 = new object();
var target2 = new object();
var target3 = new object();
var reference1 = new ComparableWeakReference <object>(target1);
var reference2 = new ComparableWeakReference <object>(target2);
var reference3 = new ComparableWeakReference <object>(target3);
var dict = new Dictionary <ComparableWeakReference <object>, string>
{
[reference1] = "Ref 1",
[reference2] = "Ref 2",
[reference3] = "Ref 3"
};
Assert.AreEqual(3, dict.Count);
}
public void ComparableWeakReference_GetHashCode_TargetGetsGarbageCollected_HashCodeShouldNotChange()
{
ComparableWeakReference <object> reference;
int targetHashCode;
void CreateReference()
{
var target = new object(); // Valid only inside this method.
targetHashCode = target.GetHashCode();
reference = new ComparableWeakReference <object>(target);
}
CreateReference();
GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced, true); // To make sure target gets collected.
Assert.IsFalse(reference.TryGetTarget(out var _));
Assert.AreEqual(targetHashCode, reference.GetHashCode());
}
